Microwave
Consistency Meter LQ300

Toshiba's LQ300 Microwave Consistency (Density) Meter uses
a new principle, microwave phase difference measurement, to
determine the density of fluids flowing through pipes.
This exploits the way a fluid's density affects the propagation
of microwaves when they pass through it. This allows
the reliable measurement of the fluid's density by monitoring
the difference in microwave phase between the original wave
and one passed through the measured fluid. Unlike the
method that depends on monitoring the attenuation of
a transmitted wave, measuring fluid density by observing a
wave's phase difference is unaffected by flow velocity and/or
is not affected by the contamination and/or bubbles.